Insulating-lining for electrical lamp-sockets.



E. H. FREEMAN.

INSULATING LINING FOR ELECTRICAL LAMP socKBTs.

APPLICATION FILED JUNE 2l, 1911.

Patented Mar. 12, 1912.

wuwtofv Z @yam/wa? UNITED sTATEs PATENT oEEToE.

EDGAR E. FREEMAN, 0F TRENTON, NEW-JERSEY.

INSULATING-LINING FOR ELECTRICAL LAMP-SOCKETS.

Specification of Letters Ilatent.y

i Application filed June 21, 1911. serial No. 634,593.

and useful Improvements in Insulating- Linings for Electrical LamSockets, of which the following is a specification.

This invent-ion relates lto the subject of casings for electrical lampsockets, and has particularly 1n v1ew an 1mproved means for fitting thecap of the socket casing with a permanent vinsulating lining that willeffectually and satisfactorily fulfil all 0f the requirements `of theNational Board of Fire Underwriters.

Heretofore various expedients have been v volved 'fastening projectionsor elements of various kinds formedI integrally or otherwise with thesheet metal cap, or with the shellpart of the casing. In some forms oflining fastenings the resiliency of the insulating lining has beendepended upon to effect a lockingaction, while in other forms `ofconstruction effort has been made to -permanently secure' a rigid liningin place by suitable fastening elements. v

In contradistinction to the known lining fastening means aboye referredto, the present invention contemplates the provision of what may betermed a molded insulating lining for a socket cap, that is to say, theap lication tothe cap of any suitable'insw latmg material that is shapedto lining form while lin la plastic state either within or without thecap, v and then caused to become set or hardenedv about and uponsuitable anchoring projections within or u on the metal cap or the'parts thereof. guy

- suitable insulating material capable of bec; Though susceptible to awide range of' ing handled in thls way 'may beutilized in carrying outthe-invention 1n this manner.

structural modification, the essential features of the invention are'welll exemplified in the accompanying drawings, in which- Figure 1 isVan enlarged sectional view of- .the casingl cap of a lamp socketequipped with a molded insulating lining. Fig. 2 is an enlarged crosssectional view thereof on the line 2 2 of Fig. 1. '-Fig. 3 is anendened.

with a lining or washer 2 of insulating ma;

terial. This lining or washer when set to its final form, is of t-hedished type and of a size to Yregister snugly within thecorrespondinglyshaped cap. It is proposed to permanently lockthisnlinihg in place. This may be accomplished" in various ways butpreferably by means of a plurality. of inwardly projecting integralanchor spurs 3 which are forcibly punched inwardly from the bodymaterial of the c ap, by exterior means such as the pointed punches 4.The action of these punches is to fracture the spurs 3 sg as to presentragged edges that become embedded in the molded material while in aplast-ic state. Additional secur-y ing means may be provided by adovetailed anchorin rib or ribs 5 provided within the the cap, and whichrib or ribs likewise becomeA embedded in the plastic material prior toits becoming set or har- As indicated, any suitableinsulatin materialmay be employed to form the lining, that is, any insulating materiaksuch as sulfur or rubber compositions that may be molded in plastic form.and afterward -allowed to become hardened in a final form. In thisconnection it may'be observed that the cap itself may be lutilizedas themold for theplastic material to be painted, run, orpressed intoplace, orit is obvious that Patented Mar. 12, 1912.

the lining may be separately molded in its proper form, then softened byheat and pressed into the cap overl the anchors and allowedto become setor hardened, and thus becoming a permanent part of the socket cap.

I claim:

1. As an improvement in electrical lamp sockets, the combination of thesocket casing having asheet metal cap provided with introverted 'anchorelements, andV a liningl sockets, the combination of the socket casofplastic insulating material permanently molded upon the inner surface ofthe cap'v molded upon the inner surface of the cap and over and aboutsaid'prongs. 1o and over said anchor elements. l -In testimony whereof Ihereunto alii-X my 2. As an improvement in electrical lamp signature inthe presence of two Witnesses.

EDGAR H. FREEMAN.'

ing having a sheet metal cap provided with Witnesses: intravertedfracturedprongs, and a lining EDNA C. SMITH, of plastic insulatingmaterial permanently JENNIE T; MCCANN.l

